(Image credit: StudioCanal/Future) We've seen plenty of stunning movie poster designs over the last decade, proving that Hollywood doesn't have to resort to the standard 'floating head' favoured by the likes of Marvel. But the most ingenious piece of poster design might still be this cheeky example from back in 2015, which is doing the rounds online over a decade later. Legend, the Tom Hardy-led biopic of the notorious Kray twins, received mixed reviews. Amongst the four-and-five-star write ups were a bunch of two-star condemnations. But the studio found a pretty ingenious way to use one of the latter to its advantage. (Image credit: StudioCanal) Yep, those two stars nestled between Tom Hardy's two heads are exactly that – two stars. But thanks to the fact that several of the stars from better reviews are overlapped by said heads, the impression is that there could easily be another two stars hidden.…